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Pawmw Wnesseg UNTED STATES PATENT OFFICE.

WILLIAM S. ROSEGRANS, OF SAN FRANCISCO. CALIFORNIA.

EXPLODER lFOR BLASTINGCHARGS.

SPECIFICATION forming part of Letters Patent No. 230,820, dated August 3, 1880.

Application led February 6, 1879.

To all whom it may concern Be it known that I, WILLLIM S. RosEeaANs,

ot' the city and county of San-Francisco,and

State ot' California,have invented a new and useful Improvement in Exploders for Blasting Purposes; and I hereby declare that the fol-4 lulininate or permissive powde. has been employed, which, with a fuse attached, has been embedded in the charge; but these caps contain so much fulminate that they lare themselves dangerous, on account of the ease with which they may be exploded. My invention consists of an exploder formed of a tube of metal capable Vot' holding the inclosed powder, when ignited, under considerable pressure, in combination with a powder filling incapable of explosion except when ignited within a case capable of holding it under pressure; and, second, it consists in the peculiar manner of holding thefnse within the tobt-andthe explodin gpowdcr under pressure. I prefer to use with my exploder powders such as that described in the patent granted to Hafenegger, February 7, 1871, No. 111,642. The shell of the exploder is ofashape shown clearly in the drawings. It is a stron ginetzll` lic tube closed at one end and open at the other. Into this tube I introduce the powder, (represented atB,)which, if i gnited withoutcontinement will simply burn out without exploding, and which therefore may be safelyhandled or transported in the exploder.

In order to insure the explosion of the charge I use a wad ot' paste of ordinary gunpowder or equivalent substance, which maybe rolled into thin sheets and cut into disks O of a size to it the tube. This disk or wad is pressed into the tube upon the powder, and serves to hold the latter in place, and also to insure the ignition of the same by serving as a medium ot' communication between the fuse and powder.

When these exploders are to be used the fuse D is pushed into the open end of the tube, which is left empty for a space for that purpose. The fuse should be pushed Idown until it touches the wad O, and the tube is then pinched or compressed, as shown at upon the fuse, so as to hold it firmlyin place. This serves to hold the powder under confinement, so that when ignited the gases will be held under pressure and an explosion caused sutliciently powerful to ignite powder ot' the class heretofore spccitied.

I am aware of the patent of Castellanos ot' July 221, 1877, No. 193,485, and desire to be understood as not claiming anything shown therein; but,

Having thus described my invention, what I claim is 1. An improved exploder, consisting of a strong tube containing a powder incapable of explosion except when ignited under confinement, said tube being adapted for connection with the fuse and to hold the powder under coniinement, as set forth.

2. The improved exploder consisting of the inetal case tilled with powder capable ot' exploding only when ignited under conline'men-t. in combination with the fuse inserted therein, said ease being indented upon the fuse, as set forth.

` W. S. ROSECBANS. Witnesses:

GEO. H. Simone, FRANK A. BROOKS. 

